Welcome to the tConfig Wiki!
The latest version of tConfig is v0.36
Surfpup - I had a aneurysm on my brain. Link
tConfig is a content creation tool for Terraria, which allows you change existing items or create entirely new ones! It doesn't just stop there, though - in addition to items, you can also change crafting recipes, projectiles, NPCs, monsters, tiles, and pretty much anything you can think of!
Modding with tConfig was carefully designed so that you don't need any programming knowledge to get started, though it will help a lot. For the more advanced users, tConfig also allows you create scripts written in C# which are seamlessly integrated with items and other game objects which allow you to really push the game to its limits.
It's outdated, it doesn't work, but the other one is fine - download this: Accessories 2.0
Click here to download some user-made ModPacks and the tConfig installer.